This annotated hypertext edition of: An Enquiry Concerning Human Understanding was produced by Roger Jones.
The starting point for preparation of the edition was: The Internet Wiretap online edition
The conversion to hypertext was undertaken for the following reasons:
As it stands only the first steps have been completed, consisting of a rather coarse breakdown into a basic hypertext structure reflecting only Hume's structuring of the work into chapters and sections. Work on a commentary has scarce begun, and more useful linking is expected only to be introduced during the development of the commentary.
Nevertheless, even in its present state, it represents a point of some interest between a plain text edition, and the rather fine grained hypertext to be found in a recent edition (now withdrawn for copyright reasons) of Wittgenstein's Tractatus.
There are several ways in which you might be able to make use of the hypertext edition.
The idea I am exploring is that hypertext is a good way of presenting philosophy, and that preparing hypertext notes is a good way of getting an understanding of a text, and getting your own ideas straight.
Though the text of Hume's Enquiry used as a basis for this work is in the public domain, this hypertext edition is copyright Roger Bishop Jones, 1994. Permission is given to make use of this material for non-profit purposes, or to refer to the material for any purpose (though I doubt you need my permission for the latter).